Erm, don't mean to contradict what's already been said, but I used one of those small reservoir/0.725 bore master cylinders on Vitesse single-circuit brakes with an aftermarket servo on my Spyder with no problems whatsoever.
The larger reservoir was used to ensure there was enough fluid to compensate for the brake pads wearing down over time, but as car enthusiasts we check our levels regularly so won't have that problem.
The servo made a big difference to the confidence I had in the brakes as you don't need to stamp on them to get the car to stop in an emergency - on my first Goodwood trip in it I came round a bend going downhill in the rain on a dual carriageway and found both lanes ahead blocked by static traffic, which was scary enough with the boosted brakes.
I'd recommend fitting a servo, 'greenstuff' pads and grippy tyres - I found Uniroyal Rainexperts to be excellent - to make sure you can stop with real confidence.
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